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Uncompressed 10-bit 720p and Kona LH
I’m at the final stages of my current project which was edited as 720p23.98 DVCProHD, as this is the format that all of the original meterial was shot in. I’m now prepping for a filmout. I’ll be delivering a 1280×720 23.976 Uncompresed 10-bit QT to the company doing the filmout.
Here’s my issue:
Everything works great and looks fine, however as soon as I switch the video playback in FCP to AJA Kona 720p59.94 10 Bit, playback becomes green snow. I see picture when parked on the timeline, but it won’t play out. Switching to 8-bit provides okay playback, but it is a bit shimmery because the sequence compressor is 10-bit. My question is this: Is this just my system, or is it just not possible to get the Kona to play out 720p at 10 bit?
I did a test and I can play out NTSC at 10 bit and 1080i29.97 at 10 bit. It only seems to be 720p that won’t play out at 10 bit.
I unrendered everything, switched the compressor for the sequence to Uncompressed 10-bit 4:2:2, changed the video processing to render all in high precision YUV, set motion filtering to best, and rendered. Hit play, green snow to monitor, but proper playback in canvas.
Exported a self contained QT, plays fine in QT player, plays fine for the folks doing the filmout, it just won’t play out to my monitor through the Kona LH when FCP playback is set to 10 bit. Actually I have two monitors in the bay right now, one is a Sony Luma showing a downconverted SD signal (via SDI) the other is a Sony BVM-D24E showing the HD signal (via HD-SDI). Both show green snow when playback is set to 10 bit, so I know this is not caused by letting the Kona LH downconvert to SD.
FCP 5.1.4
Kona LH 3.4
OS X 10.4.10
QT 7.1.6Ideas? Suggestions?
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4 Replies
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Hi Dan,
You put your DVCProHD footage in a 10b Unc sequence.
Did you set “Render al YUV material in high-precission YUV”?
This is something that I experienced back in FC 5.1 (it doesn’t happens in FC6).
If you don’t force the “High precission rendering”, even if your sequence is 10b, you will end up with an 8b clip because the DVCProHD footage is just 8b.
This could be the issue.
Rafael -
Like I said, I did set it to render in high precision YUV. But I think you’ve pointed me in the right direction. I think it may have something to do with the fact that DVCProHD is anamorphic. I can cut raw footage into a 10-bit sequence and it scales up to 133.33% with an aspect ratio of -33.33 on the distort setting. After rendering, this plays fine.
But what I can’t seem to do is switch an already edited sequence to Uncompressed 10-bit and play it out. Also if I copy and paste from an anamorphic 960×720 sequence to a non-anamorphic 1280×720 sequence, then everything distorts and repositions incorrectly. So I think what I’ll have to do work as usual and just render out the Uncompressed QT without ever being able to view it at 10-bit in the edit bay.
After a bit more testing, I’ve found that I can just set High precision YUV rendering in my DVCProHD timeline and see results that are very close to what they will be in the 10-bit QT that I will ultimately deliver to the filmout people.
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Dan,
Think about to get FC6. It really makes those processes much, much easier.
Rafael -
Well, the system is owned by the production company that I’m working for, so really that is their call. I suggested it before we went into post, but at this point I’ll wait until the next show. I need to deliver to the company doing the filmout on August 4, so this is not a good time to do an upgrade. Maybe before the next project.
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